Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 125, Issue 22, Pages 12107-12117Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c01673
Keywords
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Funding
- Educational Department of Liaoning Province, P. R. China [J2020047]
- Research Grants Council of the Hong Kong Special Administrative Region, P. R. China [CityU 11219819]
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BA(Y1-x-yErxYby)F-5/polyacrylonitrile (BYF-EY/PAN) composite fibers with thermal response function and excellent flexibility were prepared using electrospinning technology. The upconversion emission shows quadratic and cubical dependence on pumping power, confirming two-photon- and three-photon-induced processes. The intense green emission is identified as the main indicator of noncontact temperature sensing, while the faintish blue-violet emission can be used as an auxiliary monitoring channel to calibrate deviation, improving operational accuracy.
Ba(Y1-x-yErxYby)F-5/polyacrylonitrile (BYF-EY/PAN) composite fibers have been prepared by adopting the electrospinning technology, and fusiform-polycrystalline-implanted fibers can be fused with a thermal response function and excellent flexibility. Upconversion emission displays quadratic and cubical dependence of the photoluminescence intensity on the pumping power, confirming two-photon- and three-photon-induced processes, respectively. Among them, the intense green emission ascribed to H-2(11/2)/S-4(3/2) -> I-4(15/2) transitions is appointed as the main indicator of noncontact temperature sensing, and the faintish blue-violet emission originated from (4)G(11/2)/H-2(9/2) -> I-4(15/2) transitions can be served as an auxiliary monitoring channel to calibrate deviation, thereby improving operational accuracy. At a relatively moderate working temperature (363 K), the absolute sensitivity and relative sensitivity of composite fibers reach as high as 0.455 and 0.832% K-1 for main sensing and 0.391 and 2.176% K-1 for auxiliary sensing, respectively. The developed BYF-EY/PAN fiber with outstanding dual-feedbacked temperature sensing is promising to act as flexible sensing elements in fabrics and biomedical devices.
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